package com.nowcoder.community.controller.advice;

import com.nowcoder.community.util.CommunityUtil;
import org.slf4j.Logger ;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;


/**
 * <p>Title: ExceptionAdvice</p>
 * <p>author 12427</p>
 *
 * @version ver1.0
 * @date 2022/8/18 17:26
 */
@ControllerAdvice(annotations = Controller.class)
public class ExceptionAdvice {


    private static final Logger logger = LoggerFactory.getLogger(ExceptionAdvice.class) ;

    @ExceptionHandler({Exception.class})
    public void handleException(Exception e , HttpServletRequest request , HttpServletResponse response) throws IOException {
        logger.error("服务器发生异常" + e.getMessage());
        for(StackTraceElement element:e.getStackTrace()) {
            logger.error(element.toString());
        }

        //  判断是否是异步请求
        String xRequestedWith = request.getHeader("x-requested-with");
        if("XMLHttpRequest".equals(xRequestedWith)) {
            // 是异步请求
            response.setContentType("application/plain;charset=utf-8");
            PrintWriter writer = response.getWriter();
            writer.write(CommunityUtil.getJSONString(1 , "服务器异常!"));
        }else{
            response.sendRedirect(request.getContextPath() + "/error");
        }



    }


}
